Piston three-way valve

Abstract

The utility model discloses a piston type three -way valve relates to fluid valve technical field, including valve body, valve core and straight stroke air cylinder, be provided with three fluid inlet and outlet channels of Y shape arrangement on the valve body, the middle part of valve body is provided with the transverse valve hole of intercommunication three fluid inlet and outlet channels, and the valve core is penetrated in the valve hole, the valve core includes valve rod, piston and bellows, and one end of valve rod is connected straight stroke air cylinder, and the other end of valve rod is inserted into the valve hole of valve body, and the rod body of valve rod in the valve hole is provided with bellows, limit sealing block and piston in proper order, and when straight stroke air cylinder drives valve rod to move to left, can block one fluid inlet and outlet channel, and the other two fluid inlet and outlet channels are conducted, and when straight stroke air cylinder drives valve rod to move to right, can block one in the other two fluid inlet and outlet channels, and the remaining two fluid inlet and outlet channels are conducted, the piston type three -way valve in the utility model has the advantages of simple structure, small, good tightness.

Description

Technical Field

[0001] This utility model relates to the field of fluid valve technology, and in particular to a piston-type three-way valve. Background Technology

[0002] A commonly used three-way valve achieves fluid switching between three channels by rotating the valve core to change the fluid flow path. However, this type of three-way valve generally suffers from drawbacks such as complex structure and large size. Utility Model Content

[0003] The purpose of this utility model is to provide a piston-type three-way valve to solve the problems existing in the prior art, which has the advantages of simple structure, small size and good sealing performance.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] This utility model provides a piston-type three-way valve, including a valve body, a valve core, and a linear stroke cylinder. The valve body has three fluid inlet and outlet channels arranged in a Y-shape. A transverse valve hole connecting the three fluid inlet and outlet channels is provided in the middle of the valve body. The valve core passes through the valve hole. The valve core includes a valve stem, a piston, and a bellows. One end of the valve stem is connected to the linear stroke cylinder, and the other end of the valve stem extends into the valve hole of the valve body. The valve stem located in the valve hole has a bellows, a limiting sealing block, and the piston arranged sequentially on the stem. When the linear stroke cylinder drives the valve stem to move to the left, it can block one of the fluid inlet and outlet channels, while the other two fluid inlet and outlet channels are open. When the linear stroke cylinder drives the valve stem to move to the right, it can block one of the other two fluid inlet and outlet channels, while the remaining two fluid inlet and outlet channels are open.

[0006] Preferably, the fluid inlet / outlet channel includes fluid inlet / outlet channel one, fluid inlet / outlet channel two, and fluid inlet / outlet channel three, wherein fluid inlet / outlet channel one and fluid inlet / outlet channel two are disposed at the top of fluid inlet / outlet channel three, and fluid inlet / outlet channel one and fluid inlet / outlet channel two are symmetrically arranged with the axis of fluid inlet / outlet channel three as the center.

[0007] Preferably, the valve orifice includes orifice one, orifice two, and orifice two is disposed between orifice one and orifice three. The diameter of orifice two is smaller than that of orifice one and orifice three, and the diameters of orifice one and orifice three are equal. Fluid inlet / outlet channel one is connected to valve orifice one, fluid inlet / outlet channel two is connected to valve orifice three, and fluid inlet / outlet channel three is connected to valve orifice two.

[0008] Preferably, a bellows seat is provided between the valve body and the linear stroke cylinder, the bellows is disposed between the limiting sealing block and the bellows seat, and the bellows seat is provided with an exhaust hole communicating with the inner cavity of the bellows.

[0009] Preferably, the bellows seat is fixed to one end of the valve body near the linear stroke cylinder by bolts, a sealing ring is provided between the bellows seat and the valve body, and the other end of the bellows seat is connected to the linear stroke cylinder by bolts.

[0010] Preferably, the two ends of the bellows are welded to the bellows seat and the limiting sealing block, respectively.

[0011] Preferably, the limiting sealing block includes an integrally formed large cylinder and a small cylinder. The diameter of the large cylinder is equal to the diameter of the third hole, and a flow guide groove is distributed on its outer circumference to allow fluid to pass through. The diameter of the small cylinder is equal to the diameter of the second hole. An arc-shaped cylindrical sealing surface is provided between the large cylinder and the small cylinder. An arc-shaped hole sealing surface is provided between the second hole and the third hole. When the cylindrical sealing surface is in contact with the hole sealing surface, it can block the conduction between the second hole and the third hole.

[0012] Preferably, the valve stem is provided with a piston mounting rod, the piston is mounted on the piston mounting rod, and the outer circumference of the piston is provided with two slip rings with guide grooves, the slip rings being slidably connected in the first hole. The piston is provided with an arc-shaped piston sealing surface at one end near the second hole, and an arc-shaped hole sealing surface is provided between the first hole and the second hole. When the piston sealing surface and the hole sealing surface are in contact, the communication between the first hole and the second hole can be blocked. The piston mounting rod is provided with a limiting shoulder, one end of the piston is engaged with the limiting shoulder, and the other end of the piston is provided with a gasket and locked by a nut threaded to the piston mounting rod.

[0013] Preferably, a valve cover is provided on the end of the valve body away from the linear stroke cylinder to seal the valve hole. The valve cover is fixed to the valve body by bolts, and a sealing ring is provided between the valve cover and the valve body.

[0014] Preferably, the valve stem is connected to the telescopic rod of the linear stroke cylinder via a coupling.

[0015] The present invention achieves the following technical advantages over the prior art:

[0016] The piston-type three-way valve of this invention switches the flow direction of fluid through the linear movement of the piston. It has good sealing performance, high pressure resistance, small size and weight, and is easy to operate, install and maintain. It can effectively prevent fluid leakage and ensure the normal operation of the system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the piston-type three-way valve in this utility model;

[0019] Figure 2 This is a cross-sectional view of the piston-type three-way valve in this utility model;

[0020] Figure 3 This is a cross-sectional view of the valve body in this utility model;

[0021] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0022] Figure 5 This is a three-dimensional structural diagram of the valve stem in this utility model;

[0023] Figure 6 This is a three-dimensional structural diagram of the piston in this utility model;

[0024] In the diagram: 1. Cover plate; 2. Piston; 3. Valve stem; 4. Valve body; 5. Bellows; 6. Bellows seat; 7. Coupling; 8. Linear stroke cylinder; 9. Fluid inlet / outlet channel one; 10. Fluid inlet / outlet channel two; 11. Fluid inlet / outlet channel three; 12. Hole one; 13. Hole two; 14. Hole three; 15. Limiting seal block; 16. Exhaust port; 17. Guide groove one; 18. Column sealing surface; 19. Hole sealing surface one; 20. Piston mounting rod; 21. Guide groove two; 22. Piston sealing surface; 23. Hole sealing surface two. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide a piston-type three-way valve to solve the problems existing in the prior art.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The piston-type three-way valve in this embodiment, such as Figures 1-6 As shown, the device includes a valve body 4, a valve core, and a linear stroke cylinder 8. The valve body 4 has three fluid inlet and outlet channels arranged in a Y-shape. A transverse valve hole connecting the three fluid inlet and outlet channels is provided in the middle of the valve body 4, and the valve core passes through the valve hole. The valve core includes a valve stem 3, a piston 2, and a bellows 5. One end of the valve stem 3 is connected to the linear stroke cylinder 8, and the other end of the valve stem 3 extends into the valve hole of the valve body 4. The valve stem 3 is provided with a bellows 5, a limiting sealing block 15, and a piston 2 in sequence on the stem body located in the valve hole. When the linear stroke cylinder 8 drives the valve stem 3 to move to the left, it can block one fluid inlet and outlet channel, while the other two fluid inlet and outlet channels are open. When the linear stroke cylinder 8 drives the valve stem 3 to move to the right, it can block one of the other two fluid inlet and outlet channels, while the remaining two fluid inlet and outlet channels are open.

[0029] In this specific embodiment, the fluid inlet and outlet channels include a first fluid inlet and outlet channel 9, a second fluid inlet and outlet channel 10, and a third fluid inlet and outlet channel 11. The first fluid inlet and outlet channel 9 and the second fluid inlet and outlet channel 10 are disposed at the top of the third fluid inlet and outlet channel 11, and the first fluid inlet and outlet channel 9 and the second fluid inlet and outlet channel 10 are symmetrically arranged with the axis of the third fluid inlet and outlet channel 11 as the center.

[0030] In this specific embodiment, the valve orifice includes orifice 12, orifice 23, and orifice 34. Orifice 23 is disposed between orifice 12 and orifice 34. The diameter of orifice 23 is smaller than that of orifice 12 and orifice 34. The diameters of orifice 12 and orifice 34 are equal. Fluid inlet / outlet channel 19 is connected to valve orifice 12, fluid inlet / outlet channel 20 is connected to valve orifice 34, and fluid inlet / outlet channel 31 is connected to valve orifice 23.

[0031] In this specific embodiment, a bellows seat 6 is provided between the valve body 4 and the linear stroke cylinder 8. A bellows 5 is disposed between the limiting sealing block 15 and the bellows seat 6. The bellows seat 6 is provided with an exhaust port 16 communicating with the inner cavity of the bellows 5. Both ends of the bellows 5 are welded to the valve stem 3 and the bellows seat 6 around their circumference, respectively. Fluid outside the bellows 5 will not leak into the space formed by the bellows 5 and the valve stem 3. The bellows 5 is composed of multiple concentric corrugations and has axial elastic deformation capability. When the valve stem 3 moves laterally to the right, it compresses the bellows 5, and the gas in the space formed by the bellows 5 and the valve stem 3 is discharged through the exhaust port 16.

[0032] In this specific embodiment, the bellows seat 6 is fixed to one end of the valve body 4 near the linear stroke cylinder 8 by bolts, and a sealing ring is provided between the bellows seat 6 and the valve body 4. The other end of the bellows seat 6 is connected to the linear stroke cylinder 8 by bolts; the sealing ring ensures the sealing between the bellows seat 6 and the valve body 4.

[0033] In this specific embodiment, the limiting sealing block 15 includes an integrally formed large cylinder and a small cylinder. The diameter of the large cylinder is equal to the diameter of the third hole 14, and a flow guide groove 17 is distributed on its outer periphery to allow fluid to pass through. The flow guide groove 17 can keep the fluid pressure at both ends of the limiting sealing block 15 equal. The diameter of the small cylinder is equal to the diameter of the second hole 13. An arc-shaped cylindrical sealing surface 18 is provided between the large cylinder and the small cylinder, and an arc-shaped hole sealing surface 19 is provided between the second hole 13 and the third hole 14. When the cylindrical sealing surface 18 and the hole sealing surface 19 are in contact, they can block the conduction between the second hole 13 and the third hole 14.

[0034] In this specific embodiment, a piston mounting rod 20 is provided on the valve stem 3, and the piston 2 is mounted on the piston mounting rod 20. Two slip rings with guide grooves 21 are provided on the outer periphery of the piston 2. The guide grooves 21 are used to keep the fluid pressure at both ends of the piston 2 equal. The slip rings are slidably connected in the hole 12. An arc-shaped piston sealing surface 22 is provided on one end of the piston 2 near the hole 23. An arc-shaped hole sealing surface 23 is provided between the hole 12 and the hole 23. When the piston sealing surface 22 and the hole sealing surface 23 are in contact, they can block the conduction between the hole 12 and the hole 23. A limiting shoulder is provided on the piston mounting rod 20. One end of the piston 2 is engaged with the limiting shoulder. The other end of the piston 2 is provided with a gasket and is locked by a nut that is threadedly connected to the piston mounting rod 20.

[0035] In this specific embodiment, a valve cover with a sealing valve hole is provided at the end of the valve body 4 away from the linear stroke cylinder 8. The valve cover is fixed to the valve body 4 by bolts, and a sealing ring is provided between the valve cover and the valve body 4 to ensure sealing.

[0036] In this specific embodiment, the valve stem 3 is connected to the telescopic rod of the linear stroke cylinder 8 via a coupling 7. Flanges are provided at the openings of fluid inlet / outlet channel 1 9, fluid inlet / outlet channel 2 10, and fluid inlet / outlet channel 3 11 for connection to pipeline components.

[0037] The assembly process of the piston-type three-way valve in this utility model is as follows:

[0038] 1) Insert the large sealing ring (number 7) into the groove on the right end face of valve body 4.

[0039] 2) Insert the valve stem 3 assembly (including valve stem 3, bellows 5, and bellows seat 6) into the valve body 4 from right to left, and use threaded parts to fasten the bellows seat 6 to the valve body 4.

[0040] 3) Fit the piston 2 into the valve body 4 from left to right with the valve stem 3, so that its right end face fits against the corresponding shoulder face of the piston mounting rod 20. Then, install the gasket and two round nuts in sequence and tighten them.

[0041] 4) Embed the sealing ring into the groove on the right end face of the cover plate 1.

[0042] 5) Secure the cover plate 1 (including the sealing ring) to the left end face of the valve body 4 with threaded parts.

[0043] 6) Secure the linear stroke cylinder 8 to the bellows seat 6 with threaded parts.

[0044] The piston-type three-way valve in this utility model works on the following principle:

[0045] When the piston rod 2 of the linear stroke cylinder 8 moves to the left, and the column sealing surface 18 of the valve rod 3 is in contact with the corresponding hole sealing surface 19 in the inner hole of the valve body 4, the valve rod 3 blocks the fluid inlet / outlet channel 2 10, the fluid inlet / outlet channel 3 11 enters, and flows out from the fluid inlet / outlet channel 1 9.

[0046] When the piston rod of the linear stroke cylinder 8 moves to the right, and the piston sealing surface 22 of the piston 2 at the left end of the valve rod 3 is in contact with the corresponding hole sealing surface 23 in the inner hole of the valve body 4, the valve rod 3 blocks the fluid inlet / outlet channel 9, and the fluid enters from the fluid inlet / outlet channel 11 and flows out from the fluid inlet / outlet channel 10.

[0047] The sealing ring between the cover plate 1 and the valve body 4 and the large sealing ring between the bellows seat 6 and the valve body 4 prevent fluid from leaking outward.

[0048] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A piston-type three-way valve, characterized in that: The device includes a valve body, a valve core, and a linear stroke cylinder. The valve body has three fluid inlet and outlet channels arranged in a Y-shape. A transverse valve hole connecting the three fluid inlet and outlet channels is provided in the middle of the valve body. The valve core passes through the valve hole. The valve core includes a valve stem, a piston, and a bellows. One end of the valve stem is connected to the linear stroke cylinder, and the other end of the valve stem extends into the valve hole of the valve body. The valve stem located in the valve hole has a bellows, a limiting sealing block, and the piston arranged sequentially on the stem. When the linear stroke cylinder drives the valve stem to move to the left, it can block one of the fluid inlet and outlet channels, while the other two fluid inlet and outlet channels are open. When the linear stroke cylinder drives the valve stem to move to the right, it can block one of the other two fluid inlet and outlet channels, while the remaining two fluid inlet and outlet channels are open. The fluid inlet / outlet channel includes fluid inlet / outlet channel one, fluid inlet / outlet channel two, and fluid inlet / outlet channel three, wherein fluid inlet / outlet channel one and fluid inlet / outlet channel two are disposed at the top of fluid inlet / outlet channel three, and fluid inlet / outlet channel one and fluid inlet / outlet channel two are symmetrically arranged with the axis of fluid inlet / outlet channel three as the center. The valve orifice includes orifice one, orifice two, and orifice two is disposed between orifice one and orifice three. The diameter of orifice two is smaller than that of orifice one and orifice three, and the diameters of orifice one and orifice three are equal. Fluid inlet / outlet channel one is connected to valve orifice one, fluid inlet / outlet channel two is connected to valve orifice three, and fluid inlet / outlet channel three is connected to valve orifice two. The limiting sealing block includes an integrally formed large cylinder and a small cylinder. The diameter of the large cylinder is equal to the diameter of the third hole, and a flow guide groove is distributed on its outer circumference to allow fluid to pass through. The diameter of the small cylinder is equal to the diameter of the second hole. An arc-shaped cylindrical sealing surface is provided between the large cylinder and the small cylinder. An arc-shaped hole sealing surface is provided between the second hole and the third hole. When the cylindrical sealing surface is in contact with the hole sealing surface, it can block the conduction between the second hole and the third hole. A piston mounting rod is provided on the valve stem, and the piston is mounted on the piston mounting rod. Two slip rings with guide grooves are provided on the outer circumference of the piston. The slip rings are slidably connected in the first hole. An arc-shaped piston sealing surface is provided on one end of the piston near the second hole. An arc-shaped hole sealing surface is provided between the first hole and the second hole. When the piston sealing surface is in contact with the hole sealing surface, it can block the conduction between the first hole and the second hole. A limiting shoulder is provided on the piston mounting rod. One end of the piston is engaged with the limiting shoulder. The other end of the piston is provided with a gasket and is locked by a nut threaded to the piston mounting rod.

2. The piston-type three-way valve according to claim 1, characterized in that: A bellows seat is provided between the valve body and the linear stroke cylinder. The bellows is located between the limiting sealing block and the bellows seat. The bellows seat is provided with an exhaust hole that communicates with the inner cavity of the bellows.

3. The piston-type three-way valve according to claim 2, characterized in that: The bellows seat is fixed to one end of the valve body near the linear stroke cylinder by bolts. A sealing ring is provided between the bellows seat and the valve body. The other end of the bellows seat is connected to the linear stroke cylinder by bolts.

4. The piston-type three-way valve according to claim 2, characterized in that: The two ends of the bellows are respectively welded to the bellows seat and the limiting sealing block.

5. The piston-type three-way valve according to claim 1, characterized in that: A valve cover is provided on the valve body at the end away from the linear stroke cylinder to seal the valve hole. The valve cover is fixed to the valve body by bolts, and a sealing ring is provided between the valve cover and the valve body.

6. The piston-type three-way valve according to claim 1, characterized in that: The valve stem is connected to the telescopic rod of the linear stroke cylinder via a coupling.

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